sys/arm/ti/am335x/am335x_lcd.c

   1 /*-
   2  * Copyright 2013 Oleksandr Tymoshenko <gonzo@freebsd.org>
   3  * All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  *
  14  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
  15  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  16  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  17  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
  18  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  19  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  20  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  21  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  22  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  23  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  24  * SUCH DAMAGE.
  25  */
  26
  27 #include <sys/cdefs.h>
  28 __FBSDID("$FreeBSD$");
  29
  30 #include <sys/param.h>
  31 #include <sys/systm.h>
  32 #include <sys/kernel.h>
  33 #include <sys/module.h>
  34 #include <sys/clock.h>
  35 #include <sys/time.h>
  36 #include <sys/bus.h>
  37 #include <sys/lock.h>
  38 #include <sys/mutex.h>
  39 #include <sys/resource.h>
  40 #include <sys/rman.h>
  41 #include <sys/sysctl.h>
  42 #include <vm/vm.h>
  43 #include <vm/pmap.h>
  44
  45 /* syscons bits */
  46 #include <sys/fbio.h>
  47 #include <sys/consio.h>
  48
  49 #include <machine/bus.h>
  50
  51 #include <dev/fdt/fdt_common.h>
  52 #include <dev/ofw/openfirm.h>
  53 #include <dev/ofw/ofw_bus.h>
  54 #include <dev/ofw/ofw_bus_subr.h>
  55
  56 #include <dev/fb/fbreg.h>
  57 #include <dev/syscons/syscons.h>
  58
  59 #include <arm/ti/ti_prcm.h>
  60 #include <arm/ti/ti_scm.h>
  61
  62 #include "am335x_lcd.h"
  63 #include "am335x_pwm.h"
  64
  65 #define LCD_PID                 0x00
  66 #define LCD_CTRL                0x04
  67 #define         CTRL_DIV_MASK           0xff
  68 #define         CTRL_DIV_SHIFT          8
  69 #define         CTRL_AUTO_UFLOW_RESTART (1 << 1)
  70 #define         CTRL_RASTER_MODE        1
  71 #define         CTRL_LIDD_MODE          0
  72 #define LCD_LIDD_CTRL           0x0C
  73 #define LCD_LIDD_CS0_CONF       0x10
  74 #define LCD_LIDD_CS0_ADDR       0x14
  75 #define LCD_LIDD_CS0_DATA       0x18
  76 #define LCD_LIDD_CS1_CONF       0x1C
  77 #define LCD_LIDD_CS1_ADDR       0x20
  78 #define LCD_LIDD_CS1_DATA       0x24
  79 #define LCD_RASTER_CTRL         0x28
  80 #define         RASTER_CTRL_TFT24_UNPACKED      (1 << 26)
  81 #define         RASTER_CTRL_TFT24               (1 << 25)
  82 #define         RASTER_CTRL_STN565              (1 << 24)
  83 #define         RASTER_CTRL_TFTPMAP             (1 << 23)
  84 #define         RASTER_CTRL_NIBMODE             (1 << 22)
  85 #define         RASTER_CTRL_PALMODE_SHIFT       20
  86 #define         PALETTE_PALETTE_AND_DATA        0x00
  87 #define         PALETTE_PALETTE_ONLY            0x01
  88 #define         PALETTE_DATA_ONLY               0x02
  89 #define         RASTER_CTRL_REQDLY_SHIFT        12
  90 #define         RASTER_CTRL_MONO8B              (1 << 9)
  91 #define         RASTER_CTRL_RBORDER             (1 << 8)
  92 #define         RASTER_CTRL_LCDTFT              (1 << 7)
  93 #define         RASTER_CTRL_LCDBW               (1 << 1)
  94 #define         RASTER_CTRL_LCDEN               (1 << 0)
  95 #define LCD_RASTER_TIMING_0     0x2C
  96 #define         RASTER_TIMING_0_HBP_SHIFT       24
  97 #define         RASTER_TIMING_0_HFP_SHIFT       16
  98 #define         RASTER_TIMING_0_HSW_SHIFT       10
  99 #define         RASTER_TIMING_0_PPLLSB_SHIFT    4
 100 #define         RASTER_TIMING_0_PPLMSB_SHIFT    3
 101 #define LCD_RASTER_TIMING_1     0x30
 102 #define         RASTER_TIMING_1_VBP_SHIFT       24
 103 #define         RASTER_TIMING_1_VFP_SHIFT       16
 104 #define         RASTER_TIMING_1_VSW_SHIFT       10
 105 #define         RASTER_TIMING_1_LPP_SHIFT       0
 106 #define LCD_RASTER_TIMING_2     0x34
 107 #define         RASTER_TIMING_2_HSWHI_SHIFT     27
 108 #define         RASTER_TIMING_2_LPP_B10_SHIFT   26
 109 #define         RASTER_TIMING_2_PHSVS           (1 << 25)
 110 #define         RASTER_TIMING_2_PHSVS_RISE      (1 << 24)
 111 #define         RASTER_TIMING_2_PHSVS_FALL      (0 << 24)
 112 #define         RASTER_TIMING_2_IOE             (1 << 23)
 113 #define         RASTER_TIMING_2_IPC             (1 << 22)
 114 #define         RASTER_TIMING_2_IHS             (1 << 21)
 115 #define         RASTER_TIMING_2_IVS             (1 << 20)
 116 #define         RASTER_TIMING_2_ACBI_SHIFT      16
 117 #define         RASTER_TIMING_2_ACB_SHIFT       8
 118 #define         RASTER_TIMING_2_HBPHI_SHIFT     4
 119 #define         RASTER_TIMING_2_HFPHI_SHIFT     0
 120 #define LCD_RASTER_SUBPANEL     0x38
 121 #define LCD_RASTER_SUBPANEL2    0x3C
 122 #define LCD_LCDDMA_CTRL         0x40
 123 #define         LCDDMA_CTRL_DMA_MASTER_PRIO_SHIFT               16
 124 #define         LCDDMA_CTRL_TH_FIFO_RDY_SHIFT   8
 125 #define         LCDDMA_CTRL_BURST_SIZE_SHIFT    4
 126 #define         LCDDMA_CTRL_BYTES_SWAP          (1 << 3)
 127 #define         LCDDMA_CTRL_BE                  (1 << 1)
 128 #define         LCDDMA_CTRL_FB0_ONLY            0
 129 #define         LCDDMA_CTRL_FB0_FB1             (1 << 0)
 130 #define LCD_LCDDMA_FB0_BASE     0x44
 131 #define LCD_LCDDMA_FB0_CEILING  0x48
 132 #define LCD_LCDDMA_FB1_BASE     0x4C
 133 #define LCD_LCDDMA_FB1_CEILING  0x50
 134 #define LCD_SYSCONFIG           0x54
 135 #define         SYSCONFIG_STANDBY_FORCE         (0 << 4)
 136 #define         SYSCONFIG_STANDBY_NONE          (1 << 4)
 137 #define         SYSCONFIG_STANDBY_SMART         (2 << 4)
 138 #define         SYSCONFIG_IDLE_FORCE            (0 << 2)
 139 #define         SYSCONFIG_IDLE_NONE             (1 << 2)
 140 #define         SYSCONFIG_IDLE_SMART            (2 << 2)
 141 #define LCD_IRQSTATUS_RAW       0x58
 142 #define LCD_IRQSTATUS           0x5C
 143 #define LCD_IRQENABLE_SET       0x60
 144 #define LCD_IRQENABLE_CLEAR     0x64
 145 #define         IRQ_EOF1                (1 << 9)
 146 #define         IRQ_EOF0                (1 << 8)
 147 #define         IRQ_PL                  (1 << 6)
 148 #define         IRQ_FUF                 (1 << 5)
 149 #define         IRQ_ACB                 (1 << 3)
 150 #define         IRQ_SYNC_LOST           (1 << 2)
 151 #define         IRQ_RASTER_DONE         (1 << 1)
 152 #define         IRQ_FRAME_DONE          (1 << 0)
 153 #define LCD_CLKC_ENABLE         0x6C
 154 #define         CLKC_ENABLE_DMA         (1 << 2)
 155 #define         CLKC_ENABLE_LDID        (1 << 1)
 156 #define         CLKC_ENABLE_CORE        (1 << 0)
 157 #define LCD_CLKC_RESET          0x70
 158 #define         CLKC_RESET_MAIN         (1 << 3)
 159 #define         CLKC_RESET_DMA          (1 << 2)
 160 #define         CLKC_RESET_LDID         (1 << 1)
 161 #define         CLKC_RESET_CORE         (1 << 0)
 162
 163 #define LCD_LOCK(_sc)           mtx_lock(&(_sc)->sc_mtx)
 164 #define LCD_UNLOCK(_sc)         mtx_unlock(&(_sc)->sc_mtx)
 165 #define LCD_LOCK_INIT(_sc)      mtx_init(&(_sc)->sc_mtx, \
 166     device_get_nameunit(_sc->sc_dev), "am335x_lcd", MTX_DEF)
 167 #define LCD_LOCK_DESTROY(_sc)   mtx_destroy(&(_sc)->sc_mtx);
 168
 169 #define LCD_READ4(_sc, reg)     bus_read_4((_sc)->sc_mem_res, reg);
 170 #define LCD_WRITE4(_sc, reg, value)     \
 171     bus_write_4((_sc)->sc_mem_res, reg, value);
 172
 173
 174 /* Backlight is controlled by eCAS interface on PWM unit 0 */
 175 #define PWM_UNIT        0
 176 #define PWM_PERIOD      100
 177
 178 struct am335x_lcd_softc {
 179         device_t                sc_dev;
 180         struct resource         *sc_mem_res;
 181         struct resource         *sc_irq_res;
 182         void                    *sc_intr_hl;
 183         struct mtx              sc_mtx;
 184         int                     sc_backlight;
 185         struct sysctl_oid       *sc_oid;
 186
 187         /* Framebuffer */
 188         bus_dma_tag_t           sc_dma_tag;
 189         bus_dmamap_t            sc_dma_map;
 190         size_t                  sc_fb_size;
 191         bus_addr_t              sc_fb_phys;
 192         uint8_t                 *sc_fb_base;
 193 };
 194
 195 static void
 196 am335x_fb_dmamap_cb(void *arg, bus_dma_segment_t *segs, int nseg, int err)
 197 {
 198         bus_addr_t *addr;
 199
 200         if (err)
 201                 return;
 202
 203         addr = (bus_addr_t*)arg;
 204         *addr = segs[0].ds_addr;
 205 }
 206
 207 static uint32_t
 208 am335x_lcd_calc_divisor(uint32_t reference, uint32_t freq)
 209 {
 210         uint32_t div;
 211         /* Raster mode case: divisors are in range from 2 to 255 */
 212         for (div = 2; div < 255; div++)
 213                 if (reference/div <= freq)
 214                         return (div);
 215
 216         return (255);
 217 }
 218
 219 static int
 220 am335x_lcd_sysctl_backlight(SYSCTL_HANDLER_ARGS)
 221 {
 222         struct am335x_lcd_softc *sc = (struct am335x_lcd_softc*)arg1;
 223         int error;
 224         int backlight;
 225
 226         backlight = sc->sc_backlight;;
 227         error = sysctl_handle_int(oidp, &backlight, 0, req);
 228
 229         if (error != 0 || req->newptr == NULL)
 230                 return (error);
 231
 232         if (backlight < 0)
 233                 backlight = 0;
 234         if (backlight > 100)
 235                 backlight = 100;
 236
 237         LCD_LOCK(sc);
 238         error = am335x_pwm_config_ecas(PWM_UNIT, PWM_PERIOD,
 239             backlight*PWM_PERIOD/100);
 240         if (error == 0)
 241                 sc->sc_backlight = backlight;
 242         LCD_UNLOCK(sc);
 243
 244         return (error);
 245 }
 246
 247 static int
 248 am335x_read_panel_property(device_t dev, const char *name, uint32_t *val)
 249 {
 250         phandle_t node;
 251         pcell_t cell;
 252
 253         node = ofw_bus_get_node(dev);
 254         if ((OF_getprop(node, name, &cell, sizeof(cell))) <= 0) {
 255                 device_printf(dev, "missing '%s' attribute in LCD panel info\n",
 256                     name);
 257                 return (ENXIO);
 258         }
 259
 260         *val = fdt32_to_cpu(cell);
 261
 262         return (0);
 263 }
 264
 265 static int
 266 am335x_read_panel_info(device_t dev, struct panel_info *panel)
 267 {
 268         int error;
 269
 270         error = 0;
 271         if ((error = am335x_read_panel_property(dev,
 272             "panel_width", &panel->panel_width)))
 273                 goto out;
 274
 275         if ((error = am335x_read_panel_property(dev,
 276             "panel_height", &panel->panel_height)))
 277                 goto out;
 278
 279         if ((error = am335x_read_panel_property(dev,
 280             "panel_hfp", &panel->panel_hfp)))
 281                 goto out;
 282
 283         if ((error = am335x_read_panel_property(dev,
 284             "panel_hbp", &panel->panel_hbp)))
 285                 goto out;
 286
 287         if ((error = am335x_read_panel_property(dev,
 288             "panel_hsw", &panel->panel_hsw)))
 289                 goto out;
 290
 291         if ((error = am335x_read_panel_property(dev,
 292             "panel_vfp", &panel->panel_vfp)))
 293                 goto out;
 294
 295         if ((error = am335x_read_panel_property(dev,
 296             "panel_vbp", &panel->panel_vbp)))
 297                 goto out;
 298
 299         if ((error = am335x_read_panel_property(dev,
 300             "panel_vsw", &panel->panel_vsw)))
 301                 goto out;
 302
 303         if ((error = am335x_read_panel_property(dev,
 304             "panel_pxl_clk", &panel->panel_pxl_clk)))
 305                 goto out;
 306
 307         if ((error = am335x_read_panel_property(dev,
 308             "panel_invert_pxl_clk", &panel->panel_invert_pxl_clk)))
 309                 goto out;
 310
 311         if ((error = am335x_read_panel_property(dev,
 312             "ac_bias", &panel->ac_bias)))
 313                 goto out;
 314
 315         if ((error = am335x_read_panel_property(dev,
 316             "ac_bias_intrpt", &panel->ac_bias_intrpt)))
 317                 goto out;
 318
 319         if ((error = am335x_read_panel_property(dev,
 320             "dma_burst_sz", &panel->dma_burst_sz)))
 321                 goto out;
 322
 323         if ((error = am335x_read_panel_property(dev,
 324             "bpp", &panel->bpp)))
 325                 goto out;
 326
 327         if ((error = am335x_read_panel_property(dev,
 328             "fdd", &panel->fdd)))
 329                 goto out;
 330
 331         if ((error = am335x_read_panel_property(dev,
 332             "invert_line_clock", &panel->invert_line_clock)))
 333                 goto out;
 334
 335         if ((error = am335x_read_panel_property(dev,
 336             "invert_frm_clock", &panel->invert_frm_clock)))
 337                 goto out;
 338
 339         if ((error = am335x_read_panel_property(dev,
 340             "sync_edge", &panel->sync_edge)))
 341                 goto out;
 342
 343         error = am335x_read_panel_property(dev,
 344             "sync_ctrl", &panel->sync_ctrl);
 345
 346 out:
 347         return (error);
 348 }
 349
 350 static void
 351 am335x_lcd_intr(void *arg)
 352 {
 353         struct am335x_lcd_softc *sc = arg;
 354         uint32_t reg;
 355
 356         reg = LCD_READ4(sc, LCD_IRQSTATUS);
 357         LCD_WRITE4(sc, LCD_IRQSTATUS, reg);
 358
 359         if (reg & IRQ_SYNC_LOST) {
 360                 reg = LCD_READ4(sc, LCD_RASTER_CTRL);
 361                 reg &= ~RASTER_CTRL_LCDEN;
 362                 LCD_WRITE4(sc, LCD_RASTER_CTRL, reg);
 363
 364                 reg = LCD_READ4(sc, LCD_RASTER_CTRL);
 365                 reg |= RASTER_CTRL_LCDEN;
 366                 LCD_WRITE4(sc, LCD_RASTER_CTRL, reg);
 367                 return;
 368         }
 369
 370         if (reg & IRQ_PL) {
 371                 reg = LCD_READ4(sc, LCD_RASTER_CTRL);
 372                 reg &= ~RASTER_CTRL_LCDEN;
 373                 LCD_WRITE4(sc, LCD_RASTER_CTRL, reg);
 374
 375                 reg = LCD_READ4(sc, LCD_RASTER_CTRL);
 376                 reg |= RASTER_CTRL_LCDEN;
 377                 LCD_WRITE4(sc, LCD_RASTER_CTRL, reg);
 378                 return;
 379         }
 380
 381         if (reg & IRQ_EOF0) {
 382                 LCD_WRITE4(sc, LCD_LCDDMA_FB0_BASE, sc->sc_fb_phys);
 383                 LCD_WRITE4(sc, LCD_LCDDMA_FB0_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1);
 384                 reg &= ~IRQ_EOF0;
 385         }
 386
 387         if (reg & IRQ_EOF1) {
 388                 LCD_WRITE4(sc, LCD_LCDDMA_FB1_BASE, sc->sc_fb_phys);
 389                 LCD_WRITE4(sc, LCD_LCDDMA_FB1_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1);
 390                 reg &= ~IRQ_EOF1;
 391         }
 392
 393         if (reg & IRQ_FUF) {
 394                 /* TODO: Handle FUF */
 395         }
 396
 397         if (reg & IRQ_ACB) {
 398                 /* TODO: Handle ACB */
 399         }
 400 }
 401
 402 static int
 403 am335x_lcd_probe(device_t dev)
 404 {
 405         int err;
 406
 407         if (!ofw_bus_is_compatible(dev, "ti,am335x-lcd"))
 408                 return (ENXIO);
 409
 410         device_set_desc(dev, "AM335x LCD controller");
 411
 412         err = sc_probe_unit(device_get_unit(dev),
 413             device_get_flags(dev) | SC_AUTODETECT_KBD);
 414         if (err != 0)
 415                 return (err);
 416
 417         return (BUS_PROBE_DEFAULT);
 418 }
 419
 420 static int
 421 am335x_lcd_attach(device_t dev)
 422 {
 423         struct am335x_lcd_softc *sc;
 424         int rid;
 425         int div;
 426         struct panel_info panel;
 427         uint32_t reg, timing0, timing1, timing2;
 428         struct sysctl_ctx_list *ctx;
 429         struct sysctl_oid *tree;
 430         uint32_t burst_log;
 431         int err;
 432         size_t dma_size;
 433
 434         sc = device_get_softc(dev);
 435         sc->sc_dev = dev;
 436
 437         if (am335x_read_panel_info(dev, &panel))
 438                 return (ENXIO);
 439
 440         int ref_freq = 0;
 441         ti_prcm_clk_enable(LCDC_CLK);
 442         if (ti_prcm_clk_get_source_freq(LCDC_CLK, &ref_freq)) {
 443                 device_printf(dev, "Can't get reference frequency\n");
 444                 return (ENXIO);
 445         }
 446
 447         rid = 0;
 448         sc->sc_mem_res = bus_alloc_resource_any(dev, SYS_RES_MEMORY, &rid,
 449             RF_ACTIVE);
 450         if (!sc->sc_mem_res) {
 451                 device_printf(dev, "cannot allocate memory window\n");
 452                 return (ENXIO);
 453         }
 454
 455         rid = 0;
 456         sc->sc_irq_res = bus_alloc_resource_any(dev, SYS_RES_IRQ, &rid,
 457             RF_ACTIVE);
 458         if (!sc->sc_irq_res) {
 459                 bus_release_resource(dev, SYS_RES_MEMORY, 0, sc->sc_mem_res);
 460                 device_printf(dev, "cannot allocate interrupt\n");
 461                 return (ENXIO);
 462         }
 463
 464         if (bus_setup_intr(dev, sc->sc_irq_res, INTR_TYPE_MISC | INTR_MPSAFE,
 465                         NULL, am335x_lcd_intr, sc,
 466                         &sc->sc_intr_hl) != 0) {
 467                 bus_release_resource(dev, SYS_RES_IRQ, rid,
 468                     sc->sc_irq_res);
 469                 bus_release_resource(dev, SYS_RES_MEMORY, rid,
 470                     sc->sc_mem_res);
 471                 device_printf(dev, "Unable to setup the irq handler.\n");
 472                 return (ENXIO);
 473         }
 474
 475         LCD_LOCK_INIT(sc);
 476
 477         /* Panle initialization */
 478         dma_size = round_page(panel.panel_width*panel.panel_height*panel.bpp/8);
 479
 480         /*
 481          * Now allocate framebuffer memory
 482          */
 483         err = bus_dma_tag_create(
 484             bus_get_dma_tag(dev),
 485             4, 0,               /* alignment, boundary */
 486             BUS_SPACE_MAXADDR_32BIT,    /* lowaddr */
 487             BUS_SPACE_MAXADDR,          /* highaddr */
 488             NULL, NULL,                 /* filter, filterarg */
 489             dma_size, 1,                        /* maxsize, nsegments */
 490             dma_size, 0,                        /* maxsegsize, flags */
 491             NULL, NULL,                 /* lockfunc, lockarg */
 492             &sc->sc_dma_tag);
 493         if (err)
 494                 goto fail;
 495
 496         err = bus_dmamem_alloc(sc->sc_dma_tag, (void **)&sc->sc_fb_base,
 497             BUS_DMA_COHERENT, &sc->sc_dma_map);
 498
 499         if (err) {
 500                 device_printf(dev, "cannot allocate framebuffer\n");
 501                 goto fail;
 502         }
 503
 504         err = bus_dmamap_load(sc->sc_dma_tag, sc->sc_dma_map, sc->sc_fb_base,
 505             dma_size, am335x_fb_dmamap_cb, &sc->sc_fb_phys, BUS_DMA_NOWAIT);
 506
 507         if (err) {
 508                 device_printf(dev, "cannot load DMA map\n");
 509                 goto fail;
 510         }
 511
 512         /* Make sure it's blank */
 513         memset(sc->sc_fb_base, 0x00, dma_size);
 514
 515         /* Calculate actual FB Size */
 516         sc->sc_fb_size = panel.panel_width*panel.panel_height*panel.bpp/8;
 517
 518         /* Only raster mode is supported */
 519         reg = CTRL_RASTER_MODE;
 520         div = am335x_lcd_calc_divisor(ref_freq, panel.panel_pxl_clk);
 521         reg |= (div << CTRL_DIV_SHIFT);
 522         LCD_WRITE4(sc, LCD_CTRL, reg);
 523
 524         /* Set timing */
 525         timing0 = timing1 = timing2 = 0;
 526
 527         /* Horizontal back porch */
 528         timing0 |= (panel.panel_hbp & 0xff) << RASTER_TIMING_0_HBP_SHIFT;
 529         timing2 |= ((panel.panel_hbp >> 8) & 3) << RASTER_TIMING_2_HBPHI_SHIFT;
 530         /* Horizontal front porch */
 531         timing0 |= (panel.panel_hfp & 0xff) << RASTER_TIMING_0_HFP_SHIFT;
 532         timing2 |= ((panel.panel_hfp >> 8) & 3) << RASTER_TIMING_2_HFPHI_SHIFT;
 533         /* Horizontal sync width */
 534         timing0 |= (panel.panel_hsw & 0x3f) << RASTER_TIMING_0_HSW_SHIFT;
 535         timing2 |= ((panel.panel_hsw >> 6) & 0xf) << RASTER_TIMING_2_HSWHI_SHIFT;
 536
 537         /* Vertical back porch, front porch, sync width */
 538         timing1 |= (panel.panel_vbp & 0xff) << RASTER_TIMING_1_VBP_SHIFT;
 539         timing1 |= (panel.panel_vfp & 0xff) << RASTER_TIMING_1_VFP_SHIFT;
 540         timing1 |= (panel.panel_vsw & 0x3f) << RASTER_TIMING_1_VSW_SHIFT;
 541
 542         /* Pixels per line */
 543         timing0 |= (((panel.panel_width - 1) >> 10) & 1)
 544             << RASTER_TIMING_0_PPLMSB_SHIFT;
 545         timing0 |= (((panel.panel_width - 1) >> 4) & 0x3f)
 546             << RASTER_TIMING_0_PPLLSB_SHIFT;
 547
 548         /* Lines per panel */
 549         timing1 |= ((panel.panel_height - 1) & 0x3ff)
 550             << RASTER_TIMING_1_LPP_SHIFT;
 551         timing2 |= (((panel.panel_height - 1) >> 10 ) & 1)
 552             << RASTER_TIMING_2_LPP_B10_SHIFT;
 553
 554         /* clock signal settings */
 555         if (panel.sync_ctrl)
 556                 timing2 |= RASTER_TIMING_2_PHSVS;
 557         if (panel.sync_edge)
 558                 timing2 |= RASTER_TIMING_2_PHSVS_RISE;
 559         else
 560                 timing2 |= RASTER_TIMING_2_PHSVS_FALL;
 561         if (panel.invert_line_clock)
 562                 timing2 |= RASTER_TIMING_2_IHS;
 563         if (panel.invert_frm_clock)
 564                 timing2 |= RASTER_TIMING_2_IVS;
 565         if (panel.panel_invert_pxl_clk)
 566                 timing2 |= RASTER_TIMING_2_IPC;
 567
 568         /* AC bias */
 569         timing2 |= (panel.ac_bias << RASTER_TIMING_2_ACB_SHIFT);
 570         timing2 |= (panel.ac_bias_intrpt << RASTER_TIMING_2_ACBI_SHIFT);
 571
 572         LCD_WRITE4(sc, LCD_RASTER_TIMING_0, timing0);
 573         LCD_WRITE4(sc, LCD_RASTER_TIMING_1, timing1);
 574         LCD_WRITE4(sc, LCD_RASTER_TIMING_2, timing2);
 575
 576         /* DMA settings */
 577         reg = LCDDMA_CTRL_FB0_FB1;
 578         /* Find power of 2 for current burst size */
 579         switch (panel.dma_burst_sz) {
 580         case 1:
 581                 burst_log = 0;
 582                 break;
 583         case 2:
 584                 burst_log = 1;
 585                 break;
 586         case 4:
 587                 burst_log = 2;
 588                 break;
 589         case 8:
 590                 burst_log = 3;
 591                 break;
 592         case 16:
 593         default:
 594                 burst_log = 4;
 595                 break;
 596         }
 597         reg |= (burst_log << LCDDMA_CTRL_BURST_SIZE_SHIFT);
 598         /* XXX: FIFO TH */
 599         reg |= (0 << LCDDMA_CTRL_TH_FIFO_RDY_SHIFT);
 600         LCD_WRITE4(sc, LCD_LCDDMA_CTRL, reg);
 601
 602         LCD_WRITE4(sc, LCD_LCDDMA_FB0_BASE, sc->sc_fb_phys);
 603         LCD_WRITE4(sc, LCD_LCDDMA_FB0_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1);
 604         LCD_WRITE4(sc, LCD_LCDDMA_FB1_BASE, sc->sc_fb_phys);
 605         LCD_WRITE4(sc, LCD_LCDDMA_FB1_CEILING, sc->sc_fb_phys + sc->sc_fb_size - 1);
 606
 607         /* Enable LCD */
 608         reg = RASTER_CTRL_LCDTFT;
 609         reg |= (panel.fdd << RASTER_CTRL_REQDLY_SHIFT);
 610         reg |= (PALETTE_DATA_ONLY << RASTER_CTRL_PALMODE_SHIFT);
 611         if (panel.bpp >= 24)
 612                 reg |= RASTER_CTRL_TFT24;
 613         if (panel.bpp == 32)
 614                 reg |= RASTER_CTRL_TFT24_UNPACKED;
 615         LCD_WRITE4(sc, LCD_RASTER_CTRL, reg);
 616
 617         LCD_WRITE4(sc, LCD_CLKC_ENABLE,
 618             CLKC_ENABLE_DMA | CLKC_ENABLE_LDID | CLKC_ENABLE_CORE);
 619
 620         LCD_WRITE4(sc, LCD_CLKC_RESET, CLKC_RESET_MAIN);
 621         DELAY(100);
 622         LCD_WRITE4(sc, LCD_CLKC_RESET, 0);
 623
 624         reg = IRQ_EOF1 | IRQ_EOF0 | IRQ_FUF | IRQ_PL |
 625             IRQ_ACB | IRQ_SYNC_LOST |  IRQ_RASTER_DONE |
 626             IRQ_FRAME_DONE;
 627         LCD_WRITE4(sc, LCD_IRQENABLE_SET, reg);
 628
 629         reg = LCD_READ4(sc, LCD_RASTER_CTRL);
 630         reg |= RASTER_CTRL_LCDEN;
 631         LCD_WRITE4(sc, LCD_RASTER_CTRL, reg);
 632
 633         LCD_WRITE4(sc, LCD_SYSCONFIG,
 634             SYSCONFIG_STANDBY_SMART | SYSCONFIG_IDLE_SMART);
 635
 636         /* Init backlight interface */
 637         ctx = device_get_sysctl_ctx(sc->sc_dev);
 638         tree = device_get_sysctl_tree(sc->sc_dev);
 639         sc->sc_oid = SYSCTL_ADD_PROC(ctx, SYSCTL_CHILDREN(tree), OID_AUTO,
 640             "backlight", CTLTYPE_INT | CTLFLAG_RW, sc, 0,
 641             am335x_lcd_sysctl_backlight, "I", "LCD backlight");
 642         sc->sc_backlight = 0;
 643         /* Check if eCAS interface is available at this point */
 644         if (am335x_pwm_config_ecas(PWM_UNIT,
 645             PWM_PERIOD, PWM_PERIOD) == 0)
 646                 sc->sc_backlight = 100;
 647
 648         err = (sc_attach_unit(device_get_unit(dev),
 649             device_get_flags(dev) | SC_AUTODETECT_KBD));
 650
 651         if (err) {
 652                 device_printf(dev, "failed to attach syscons\n");
 653                 goto fail;
 654         }
 655
 656         am335x_lcd_syscons_setup((vm_offset_t)sc->sc_fb_base, sc->sc_fb_phys, &panel);
 657
 658         return (0);
 659
 660 fail:
 661         return (err);
 662 }
 663
 664 static int
 665 am335x_lcd_detach(device_t dev)
 666 {
 667         /* Do not let unload driver */
 668         return (EBUSY);
 669 }
 670
 671 static device_method_t am335x_lcd_methods[] = {
 672         DEVMETHOD(device_probe,         am335x_lcd_probe),
 673         DEVMETHOD(device_attach,        am335x_lcd_attach),
 674         DEVMETHOD(device_detach,        am335x_lcd_detach),
 675
 676         DEVMETHOD_END
 677 };
 678
 679 static driver_t am335x_lcd_driver = {
 680         "am335x_lcd",
 681         am335x_lcd_methods,
 682         sizeof(struct am335x_lcd_softc),
 683 };
 684
 685 static devclass_t am335x_lcd_devclass;
 686
 687 DRIVER_MODULE(am335x_lcd, simplebus, am335x_lcd_driver, am335x_lcd_devclass, 0, 0);
 688 MODULE_VERSION(am335x_lcd, 1);
 689 MODULE_DEPEND(am335x_lcd, simplebus, 1, 1, 1);